How can you ensure that you have successfully updated the heap size to 4-8 GB? I updated it on my Java Runtime Environment Settings and also in the neo4j-wrapper.conf file. However, possibly due to my changing internet speed at the apartment, there is no change in speed after I increased the heap size. Also, the metric system claims that 1 GB is 1000 MB. However, in class, we learned that 1 GB is 2^10=1024 MB. Which metric system is preferred in this case?